fix(client): apply timeout to score ingestion

[sidsri14]

Problem

Score ingestion ignored LANGFUSE_TIMEOUT and LangfuseClient({ timeout }) because ScoreManager did not receive the client's resolved timeout. Generated ingestion requests therefore used their 60-second fallback during flush and shutdown.

Fixes #883.

Changes

• Pass the resolved client timeout into ScoreManager.
• Apply it to score ingestion batch request options.
• Preserve the existing environment/default fallback for direct ScoreManager construction.
• Add regression coverage for the LANGFUSE_TIMEOUT path.

Verification

• pnpm lint
• pnpm typecheck
• pnpm test (the repository-wide command includes server-backed E2E)
• pnpm test:integration
• pnpm test:e2e (requires the Docker-based Langfuse server stack; delegated to CI)
• pnpm format:check
• pnpm test:unit
• pnpm build

Release info

Bump level

• Major
• Minor
• Patch

Libraries affected

• All of them
• @langfuse/core
• @langfuse/client
• @langfuse/tracing
• @langfuse/otel
• @langfuse/openai
• @langfuse/langchain

Changelog notes

• Apply configured request timeouts to score ingestion batches.

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